Typewriting machine



May 9, 1939. H. J. HART TYPEWRITING MACHINE Filed Jan. 9, 1936 ATTORN EYS.

v ing the same.

Patented May 9, 1939 UNITED STATES TYPEWRITING MACHINE Henry J. Hart, West Hartford, Conn, assignor to Royal Typewriter Company, Inc., New York, N. Y., a corporation of New York Application January 9, 1936, Serial No. 58,405

6 Claims.

This invention relates to new and useful improvements in typewriting machines generally, although more particularly to abutments or anvils for the type bars and to the method of form- The principal objects of the invention are to provide an abutment which will reduce the noise made by a type bar contacting the same, and to provide a novel method of forming the parts thereof and assembling the same.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing:

Figure l is a front elevation of a type bar segment showing the application of myinvention thereto,, v

Figure 2 is an enlarged vertical section taken therethrough,

Figure 3 is an enlarged detail section-taken on the line 3-3 of Figure l, k Figure 4 is'an enlarged cross section of the cage,

Figure 5 is a perspective view of the rear plate of the cage,

Figure 6 is a perspective view of the anchor plate of the cage, 1

Figure '7 is a perspective view of the type bar,

uide,

Figure 8 is a perspective view of the cage, Figure 9 is a perspective view of one of the filler plates, h s

Figure 10 ,is a perspective view of the front plate of the cage, and

Figure 11 is a perspective view of the guard plate. I Referring to the accompanying drawing, the

segment A is formed along its lower portion withv the usual radially extending slots 5 for receiving the heels of type bars 6 which are pivoted on the wire I. The central portion of the segment A above the type bar pivots is formed in its front face with a recess, 8 which includes an arcuate undercut lateral wall 9. Attached to the rear face of the segment by screws I0, is the usual type 50 bar guide ll.

My improved type bar abutment includes an arcuate .cage B and one or more-arcuate filler plates C mounted therein and forming a result-.

ant laminated unit.

55 The cage B includes spaced front and rearar- (Cl. 191--1ss cuate steel plates l2 and I3 respectively. The rear or attaching plate I3 is provided along its upper edge with spaced recesses l4, and along its lower edge with spaced recesses IS, the recesses I4 and I5 being disposed in staggered relation. 5 The rear plate [3 is also provided with spaced and upwardly extending attaching ears l6 which are disposed intermediate the recesses ll. Rigidly secured to the front face of the attaching plate l3, by welds I! or other suitable means, is 10.

an arcuate anchor plate 18 which is substantially coextensive with but narrower than the plate I3. The upper edge of the plate l8 lies flush with the upper edge of the plate 13 and. consequently the recesses M are coveredby the plate i8. The lower 15 edge of the anchor plate It! is disposed above and .in spaced relation to the lower edge of the attaching plate [3.

The front or striker plate It is of the same width as the anchor plate l8, and is provided 20 along its upper edge with spaced and rearwardly extending connecting arms or lugs I9, and along its lower edge withspaced and rearwardly extending connecting arms or lugs 20 These arms or lugs'l9, 20 embrace the anchor plate l8 and 2 5 have their free ends I9, 20 bent downwardly and upwardly around the plate l8 and seated in the recesses l4, 15, thereby connecting the front plate l2 to the anchor plate I8 in spaced relation thereto. Stop lugs 2|, 2| extend from the ends 30 of the striker plate It and are bent rearwardly to close the ends of the age B.

A plurality of arcuate plates C, preferably of thin spring steel and of less thickness than the front plate I 2, but of substantially the same width 35 as the front plate l2 and the anchor plate l8,

are inserted separately side by side within the cage B prior to one of the stop lugs 2| being bent rearwardly. These filler plates C tightly fill the cage but are spaced apart by air films which function to interrupt the sound waves when the abutment is struck by the type bar and thereby reduce the noise of impact.

The cage B is positioned in the recess 8 of the segment and. is secured thereto by screws 22 which, pass through perforations in the ears l6. Two of these screws serve to fasten the sheet metal guard plate 23 to the segment. By reason of the rearfplate 13 being wider than and projecting below the front plate 12 and the filler plates C, the abutment assembly will readily fit the inclined lateral wall 9 of the recess 8 and will I be thereby further retained in the segment.

It will be noted thatthe rear plate lies flat- 25 quently the abutment against the vertical wall of the recess 8, and that this is made possible by the-recesses ll, IS in the rear plate which receive the ends I9, 20 of the arms I9, 20.

; It will also be observed that the method employed in forming my invention consists broadly in first forming an arcuate metal cage including afront striker plate, and then filling the cage with a plurality of relatively thin plates prefer- 10 ably of spring steel; that the cage is formed by first forming the front and rear plates,- then rigidly securing-the anchor plate to the rear plate, and then positioning the faint striker plate in spaced relation to the anchor plate; and

that flnallythe stop lugs are bent rearwardly to tain the filler plates against endwise displacement.

' From the foregoing, it will be seen that I have rovided' a'self-contained abutment of sounddeadening and wear-resisting construction; that 1. A type bar abutmentcomprising a cage ineluding a front striker plate,1a rear plate spaced from. the'front plate and being provided with spaced recesses along its upper and lower edges, an anchor plate rigidly connected to the front face of the rear plate and covering said recesses,

said front plate having arms extending rearwardly from the upper and lower edges thereof and having their ends bent over the anchor plate and positioned in the recesses of the rear plate, and a plurality of noise-reducing filler plates mounted within the cage between the front and 40 rear plates thereof.

2. A type bar abutment comprising a cage including a front striker plate, a rear plate spaced from the front plate and being provided with spa'cedrecesses along itsupper and lower edges,

an anchor plate rigidly connected to the front face of the rear plate and covering 'said recesses, said front plate having arms extending rearwardly from the upper and lower edges thereof and having their ends bent over the anchor plate and positioned in the recesses of the rear plate, the

upper arms being staggered with respect to the lower arms, and a plurality of noise-reducing filler. plates mounted within the cage between the front and rear plates thereof.

3. A self-contained type bar abutment comprising a cage including a front striker plate, a rear plate spaced from the front plate, and upper and lower arms loosely connecting said plates, a plurality of noise-reducing filler plates mounted within the cage between the front and rear plates thereof, and being retained by and within said cage, the entire abutment comprising the cage,

' ly from the upper and lower edges thereof and having their ends bent over the anchor plate and positioned in the recesses of the rear plate, a

plurality of noise-reducing filler plates mounted within the cage between the front and rear plates thereof, and stops extending rearwardly from the ends of the front plate for retaining the filler plates against endwise displacement.

5. The combination with a type bar segment having a central recess formed in its front face,

"said recess having ajdownwardly and rearwardly inclined lateral wall, and a type bar abutment mounted in said recess, said abutment including a front striker plate, a rear attaching plate, and

a plurality of intermediate noise-reducing plates). the attaching plate being seated on the inner end of the inclined lateral wall, and the front and intermediate plates being of substantially the same' width and having their lower edges disposed above the front edge of the lateral wall.

6. A self-contained sound-deadening type bar abutment, adapted to be mounted on a. type bar segment, said abutment comprising a front striker plate, a rear plate, connecting means extending between said front and rear plates for connecting them and limiting separating movement thereof but permitting movement of the plates relatively "toward each other, and a plurality of filler plates interposed between said front and rear, plates, the front and rear plates and said connecting means therebetween maintaining said filler plates in assembly with air films therebetween, the entire abutment being at- 1 tachable as a unit to and removable as a unit from the type-bar segment.

HENRY J. HART. 

